Coal-screen and ash-sifter



T. MCGOLDRICK. COAL SCREEN AND AS-I SIFTER.

APPucATloN FILED Nov. 5. |919. 1,346,905, Patented July 20,1920.

. 2 SHEETS-SHEET 1.

T.'M cGOLDR|CK. COAL SCREEN AND ASH SIFTER;

APPLICATION FILED NOV. 5| 191.9. l

Patented July 20, 1920.

2 sums-SHEET 2.

UNITED STA.T5Sv

PATENT OFFICE.

TIMOTHY- MeeoLfDHIoI,v or LINCOLN, New HAMT'SHIRE.

V COAL-'SCREEN ANI) ASH-sufren.;

Spe'ciication of ietters Patent.

lttented.v J uly 2.0, 192,0.

Application filed' November 51,y 1919: serial No. 335,921;

tain new and' useful Improvements in Coal- Screens and Ash-Sifters, of. which the following is a'specificati'on', reference being had to the accompanying drawings.

This invention relates to a coalv screen or ash sifter, and particularly to screens used in households for separating ashes fromcoal.

The general object of this invention is to provide a very simpl-y constructed), easily operated, and effective' screening machine of this character wherein' the screen,v byl. a simple mechanism is' given a longitudinally reciprocating and oscillating motion.

A further obj ect is to provide a construction ofth'is character wherein heavier particles of material not passing through the screen are discharged ontoan apron for discharge from the casing in which the screen is located.

A further object is to provide a machine of this character in which the parts are all housed so that the dust arising from the sifting operation will be confined within the casing. y

Other objects will appear inthe course of the following description.

My invention is illustrated n the accompanying drawings, wherein Figure 1 is a vertical sectional view of a coal screen constructed in accordance with my invention;

Fig. 2 is a section on the line 2-2 of Fig. 1;

Fig. 3 is a sectional view on the line 3-3 of Fig. 2;

Fig- 4 is a fragmentary vertical sectional view in the same plane as Fig. 2, but showing a modified manner of mounting the coal screen;

Fig. 5 is a fragmentary vertical section through the casing showing the coal screen of Fig. 4 in elevation;

Fig. 6 is a like view to Fig. 5 but showing a modified manner of transmitting power to the coal screen.

Referring to these drawings, and par-v end. The Alower end of the casing 10 is provided with a hinged door 14 whereby the ash box-15 may be withdrawnv from the casing. At one point the front of the casing is providedl with an opening 16, and below this opening in Fig. 2 there are disposed the upwardly extending tracks 17 formed of` angle iron, these tracks extending upwardly 'and rearwardly. Carried by the forward ends of the trucks and extending out through the opening 16 is an apron or chute' 18 supportedv by an angle iron' 19.

Disposed within the casingl 10 is a rectangular screen 2O open at the top and having its bottom andA sides made of screening material, which is perforated' sheet metal, reticulated-'metahor the like. This screen is open at its forward end and is provided with rollers 21 mounted'upon transversek rod 22', they ends' of which are cranked to receivesaid rollers, this rod being attached to a supporting screen. The rod preferably extends beneath the screen and the rollers support the screen slightly above the upper surface of the tracks 17. At its rear end, the screen is supported by a crank shaft 23 which extends beneath the screen and has its ends upwardly bent and then outwardly bent and passed through bearings 24 in the side walls of the casing. One extremity of this crank shaft is provided with a crank handle 25 whereby the shaft may be rotated. By rotating the crank shaft, it isobvious that the screen will be reciprocated longitudinally' and oscillated vertically upon the fulcrum formed by the o wheels 21, and that thus the material within the screen will be given an up and down motion,causing the lighter ashes, cinders,

etc., to work downward toward the bottom of the screen and through the screen, Vwhile the heavier material works upward toward the top ofthe screen and at the same time y coal will be discharged from the forward end of the screen onto the apron 18, while theV ashes, cinders, and other small like particles will pass through the screen into the ash box 15. It is obvious that it is not necessary to remove the screen in order to discharge the coal therefrom, but that thiscoal be discharged through the opening 16 as the machine is operated. By opening the cover 11, access to the screen may be had,

but ordinarily the material to be screened shaft 23a.

will be discharged through the hopper l2 and then the cover closed so as to prevent the upward passage of dust and ashesy through the top of the machine.

In Fig. 4I show a modified form of my device wherein the screen 2Oa is mounted upon a crank shaft 26 connected by a slotted link 27 to the crank Otherwise than this, the construction illustrated in Fig. 4C is the same as that illustrated Vin Fig. l, but with this form of the invention the forward end of the screen is given an oscillating movement on the forward crank shaft, which I have found extremely effective in separating the coarse and fine particles of ashes and coal and discharging the coal onto the chute or apron 18.

It is obvious that by making the cranks of the crank shafts 232L and 26 of relatively different lengths, that the rear portion Vof the screen, for instance, may be given a greater amplitude of movement than the forward portionof the screen, as I have illustratedl it, so as to secure a relative oscilla-Y tion of the screen. n 1

As illustrated in Fig. 6, itis, ofcourse, Ypossible to drive the crank shaft 23through multiplying gears 28 and 29. It is also obvious that instead of discharging into an forward end of the ash box, the casing l0 might discharge directly into a barrel. ,Y

While I have illustrated the preferred form of my invention, it will be obvious that minor changes in the details of construction and arrangement of parts might be Vmade without departing from the spirit of the invention.

I claim A screening device of the character described comprising a casing having an opening in its front wall, an apron secured to the casing, and extending throughsaid opening,

said apron inclined toward the top of the,

casing and having extensions on its rear end portions to provide spaced parallel inclined tracks, a screen receptacledisposed between said tracks in spaced 'relation thereto, said receptacle being open at its top and one end,

an axle mounted on the bottom ofthe reg TIMOTHY MCeoLDRioK. 

